Citrix Xen Server 虚拟机迁移至 VMware 虚拟化平台

一、前言

随着虚拟化技术的快速发展，各厂商虚拟化产品也是百花齐放，企业或政府机构在早期建设中会存在多个厂商虚拟化产品，随着虚拟化技术越来越成熟，带来的是企业私有云、政务云统一规划建设，进而对现有虚拟化产品统一整合、改造，已经成为私有云建设中重要环节。

在虚拟化整合过程中，经常会涉及以下整合：

1、物理机迁移至VMware虚拟化平台；

2、VMware ESXi 低版本虚拟机迁移至VMware ESXi 高版本虚拟化平台；

3、Citrix Xen Server虚拟机迁移至VMware ESXi 6.7虚拟化平台；

4、VMware虚拟机迁移至KVM虚拟化平台等等。

列举：Citrix Xen Server Linux虚拟机迁移至VMware ESXi 6.7虚拟化平台进行技总结。

二、迁移准备工作

一、环境说明

1、源虚拟化环境：Citrix Xen Server 6.1

2、目标虚拟化环境：VMware ESXi 6.7.0 U1

3、迁移虚拟机OS类型：CentOS 6.4、Windows 2008、Windows 2003

4、迁移工具：VMware-converter-en-6.2.0-8466193

5、VMware-converter server OS类型：Window2012 R2

二、迁移流程

由于都是生产业务系统迁移，迁移前应按照以下开展：

三、注意事项

1、进行VMware-converter服务端安装。

2、检查源虚拟机业务类型和操作系统版本，确认是否在converter兼容性列表里。

1）、如果源是域控制器，应进行特殊考虑。VMware 不建议使用 Converter 虚拟化活动域控制器。

2）、如果源是 Microsoft Exchange、SQL 或DB2、Oracle等其他数据库服务器，VMware 建议在转换之前关闭应用程序 (Microsoft Exchange/SQL) 和数据库服务。这将最大程度地减少任何损坏数据库表或使目标虚拟机中的数据失效的机会。

3）、在转换期间禁用实时防病毒扫描。

3、迁移前对VMware-converter服务端、虚拟机源端相关防火墙进行关闭。

Linux 迁移过程中，使用以下端口服务：

四、技术原理

1、远程热克隆在线运行的windows 虚拟机技术原理

1）、Converter Standalone prepares the source machine for the conversion.

Converter Standalone为转换准备源计算机。

Converter Standalone installs the agent on the source machine and the agent takes a snapshot of the source volumes.

Converter Standalone在源计算机上安装代理，代理将获取源卷的快照。

2）、Converter Standalone prepares the virtual machine on the destination machine.

Converter Standalone creates a virtual machine on the destination machine and the agent copies volumes from the source machine to the destination machine.

3）、Converter Standalone finishes the conversion process.

The agent installs the drivers required for the operating system to start in a virtual machine and personalizes the virtual machine (changes the IP information, for example)

4）、Optionally, Converter Standalone uninstalls the agent from the source machine.

The virtual machine is ready to run on the destination server.

2、远程热克隆在线运行的Linux 虚拟机技术原理

In Linux conversions, no agent is deployed on the source machine. Instead, a helper virtual machine is created and deployed on the destination ESXi host. The source data is then copied from the source Linux machine to the helper virtual machine. After the conversion is complete, the helper virtual machine shuts down to become the destination virtual machine the next time you power it on.Converter Standalone supports conversion of Linux sources only to managed destinations.The following workflow demonstrates the principles of hot cloning powered on source machines that run

Linux to managed destinations.

1）、Converter Standalone uses SSH to connect to the source machine and retrieves source information.Converter Standalone creates an empty helper virtual machine based on your conversion task settings. The helper virtual machine serves as a container for the new virtual machine during conversion. Converter Standalone deploys the helper virtual machine on the managed destination, an ESXi host. The helper virtual machine boots from a *.iso file that is located on the Converter Standalone server machine.

2）、The helper virtual machine powers on, boots from the Linux image, connects to the source machine through SSH, and starts retrieving the selected data from the source. While you set up the conversion task, you can select which source volumes to be copied to the destination machine.

3）、Optionally, after data is copied, the destination virtual machine is reconfigured to allow the operating system to start in a virtual machine.

4）、 Converter Standalone shuts down the helper virtual machine. The conversion process is complete.You can configure Converter Standalone to power on the newly created virtual machine after the conversion is complete.